Abaixo está uma instrução que descreve uma tarefa de geração de SQL, combinada com uma entrada que fornece mais contexto sobre os esquemas de tabela disponíveis. Escreva o código SQL que responda adequadamente à solicitação
 ###Instrução: Emprego (salários e vencimentos) de 64%, e uma pensão ocupacional de 6% têm qual crédito tributário trabalhista?
 ###Tabelas: CREATE TABLE planned_for_theatrical_release_but_never_screened_theatrically (planned_for_theatrical_release_but_never_screened_theatrically_id AUTO_INCREMENT PRIMARY KEY, Title VARCHAR, Series VARCHAR, Director VARCHAR, Characters VARCHAR, Release date VARCHAR) CREATE TABLE sources_of_income (sources_of_income_id AUTO_INCREMENT PRIMARY KEY, Region VARCHAR, Employment ( salaries & wages) VARCHAR, Self employed VARCHAR, Investment income VARCHAR, Working tax credit VARCHAR, State pensions VARCHAR, Occupational pensions VARCHAR, Disability benefits VARCHAR, Other social security benefits VARCHAR, Other income sources VARCHAR) CREATE TABLE third_format (third_format_id AUTO_INCREMENT PRIMARY KEY, Cover Date VARCHAR, Story Title VARCHAR, Writer/s VARCHAR, Letterer/s VARCHAR, Colourist/s VARCHAR) CREATE TABLE 2009_ladder_and_finals (2009_ladder_and_finals_id AUTO_INCREMENT PRIMARY KEY, Benalla DFL VARCHAR, Wins INT, Losses INT, Draws INT, Byes INT, Against INT) CREATE TABLE men_indoor (men_indoor_id AUTO_INCREMENT PRIMARY KEY, Pos. INT, Mark VARCHAR, Athlete VARCHAR, Venue VARCHAR, Date VARCHAR)  
SELECT Working tax credit FROM sources_of_income WHERE Employment ( salaries & wages) = 64% AND Occupational pensions = 6%